our pentagon correspondent chris lawrence has been looking into this. what's being considered for a u.s. role in afghanistan after the scheduled pull-out? >> reporter: if you thought 2014 was going to be the end of u.s. troops' involvement, that does not look to be the case. although publicly pentagon officials say it's too early, our source, a u.s. official is telling us that there are several options being discussed inside the pentagon, one of which is to keep about 10,000 u.s. troops in afghanistan past 2014. a small number of those troops would be special operations forces that would be dedicated to counterterrorism missions. the rest of the forces would either be training or advising afghan troops or providing medical support and air support, things like that. there are other options with fewer troops, some with more troops. but this one fits right in the middle of that spectrum. he also told me that one of the deal-breakers when it came to iraq, immunity for u.s. troop, in other words, that they wouldn't be prosecuted under local laws like afghan